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US 7,066,253 B2Granted
Casing shoe
AssigneeWeatherford/Lamb, Inc.
InventorPeter John Baker
Life of this patent
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Abstract
A shoe for guiding a string within a well-bore comprises an annular body of relatively hard material and a nose portion of relatively soft material which are interlocked so that when the nose portion is drilled through, any remaining parts are held against the annular body. Interlocking is achieved by a dovetail thread. Embodiments are described for the shoe as a reamer shoe and as a drill bit to run in casing.
Claims19
A shoe for guiding a string within a wellbore, comprising:
- an annular body having a bore extending there through;
- and
- a nose portion positively retained to the body by an interlocking arrangement located on an inner surface of the body and an outer surface of the nose portion, characterized in that the interlocking arrangement is a dovetail thread and a minimum inner diameter defined by the interlocking arrangement is relatively larger than a bore inner diameter generally along a remainder of the annular body.
A shoe for guiding a string within a wellbore, comprising:
- an annular body having a bore extending there through;
- and
- a nose portion positively retained to the body by an interlocking arrangement, characterized in that the nose portion is of a unitary construction and a minimum inner diameter defined by the interlocking arrangement is relatively larger than a bore inner diameter generally along a remainder of the annular body.
A method of installing a tubular string in a borehole, comprising:
- providing a shoe having a nose member positively retained to an annular body of the shoe by an interlocking arrangement;
- inserting the tubular string into the borehole with the shoe attached to the tubular string;
- and
- drilling out a central section of the nose member leaving one or more portions of the nose member attached to the annular body, wherein the interlocking arrangement is positively retaining the one or more portions by preventing the one or more portions from moving in an inward radial direction upon drilling out the central section,
- wherein the interlocking arrangement is positively retaining the one or more portions that includes a crescent shaped shell section of the nose member due to non-concentric drilling out of the central section.
2 more elements
Dependencies are inferred from the claim text.